I don't know about donjohnjr but Ivanka seems to follow daddy dearest's command and doesn't drink alcohol.I don't know if she drinks coffee or not. Son Eric is President of the Trump Estates Winery and I expect does drink. Whether Melania does or Barron will or Tiffany does/will or his past wives or any of his sex partners or mistresses didn't drink I don't know. It's a personal decision which everyone has the right to make for himself/herself. OF COURSE. But to make it for others? That's pretty dictatorial and authoritarian and I wouldn't DARE order my grown son to do anything. That would go over like a lead balloon. Does Ivanka intimidate easily? Will she always obey daddy or when he dies will she finally drink whatever she wants? Just a wonderin'.